
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Random;
import java.util.Scanner;
public class Jdbcselect {
    public static void main(String[] args) throws SQLException {
        //创建并初始化数据源
        DataSource dataSource=new MysqlDataSource();
        ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/j2?characterEncoding=utf8&&useSSL=false");
        ((MysqlDataSource)dataSource).setUser("root");
        ((MysqlDataSource)dataSource).setPassword("123456");
        //与数据库建立连接
        Connection connection= dataSource.getConnection();

        //写sql语句
        String sql="select* from student";
        PreparedStatement statement=connection.prepareStatement(sql);//预编译
        //执行sql

        ResultSet resultSet=statement.executeQuery();
        while(resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id ="+ id+" "+"name ="+name);
        }
        //释放资源
        resultSet.close();
        statement.close();
        connection.close();

    }
}
